package com.nowcoder.community.quartz;
import com.nowcoder.community.entity.DiscussPost;
import com.nowcoder.community.service.DiscussPostService;
import com.nowcoder.community.service.ElasticsearchService;
import com.nowcoder.community.service.LikeService;
import com.nowcoder.community.util.RedisKeyUtil;
import com.nowcoder.community.util.XaCommunityConstant;
import org.quartz.Job;
import org.quartz.JobExecutionContext;
import org.quartz.JobExecutionException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.BoundSetOperations;
import org.springframework.data.redis.core.RedisTemplate;
import javax.annotation.Resource;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;

public class PostScoreRefreshJob implements Job, XaCommunityConstant {
    private static final Logger logger = LoggerFactory.getLogger(PostScoreRefreshJob.class);
    @Resource
    private RedisTemplate redisTemplate;
    @Resource
    private DiscussPostService discussPostService;
    @Resource
    private LikeService likeService;
    @Resource
    private ElasticsearchService elasticsearchService;
    private static final Date epoch;// 牛客纪元
    static {
        try{
            epoch=new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").parse("2024-05-01 00:00:00");
        } catch (ParseException e) {
            throw new RuntimeException("初始化牛客纪元失败!",e);
        }
    }
    
    @Override
    public void execute(JobExecutionContext jobExecutionContext) throws JobExecutionException {
        String redisKey= RedisKeyUtil.getPostScoreKey();
        BoundSetOperations operations = redisTemplate.boundSetOps(redisKey);
        if(operations.size()==0){
            logger.info("[任务取消] 没有需要刷新的帖子!");
            return;
        }
        logger.info("[任务开始] 正在刷新帖子分数: " + operations.size());
        while (operations.size() > 0) {
            this.refresh((Integer) operations.pop());
        }
        logger.info("[任务结束] 帖子分数刷新完毕!");
    }
    private void refresh(int postId){
        DiscussPost post=discussPostService.findDiscussPostById(postId);
        if(post==null){
            logger.error("该帖子不存在: id = " + postId);
            return ;
        }
        //是否精华
        boolean wonderful=post.getStatus()==1;
        //评论数量
        int commentCount=post.getCommentCount();
        //点赞数量
        long likeCount=likeService.findEntityLikeCount(ENTITY_TYPE_POST,postId);
        //计算权重
        double w=(wonderful?75:0)+commentCount*10+likeCount*2;
        double score=Math.log10(Math.max(w,1))
                +(post.getCreateTime().getTime()-epoch.getTime())/(1000*3600*24);
        //更新帖子分数
        discussPostService.updateScore(postId,score);
        //同步更新搜索数据
        post.setScore(score);
        elasticsearchService.saveDiscussPost(post);
    }
}
